Heat dissipating structure of a flexible display

Abstract

A heat dissipation structure for a flexible display is disclosed, and includes: a substrate, an anode metal layer, light emitting diode elements, a pixel defining layer, a cathode metal layer, and a heat conducting insulator disposed in sequence. The pixel defining layer has grooves, and the heat conducting insulator is sandwiched between the anode metal layer and the cathode metal layer, and disposed in the grooves. The heat conducting insulator is used to connect the anode metal layer and the cathode metal layer, so as to form an electrically insulating and thermally conducting path between the anode metal layer and the cathode metal layer.

What is claimed is: 
     
       1. A heat dissipating structure of a flexible display, comprising:
 a substrate provided with an active layer thereon, wherein the active layer is connected to a source electrode and a drain electrode; 
 an anode metal layer electrically connected to the drain electrode; 
 a plurality of light emitting diode elements disposed on the anode metal layer and electrically connected to the anode metal layer; 
 a pixel defining layer disposed on the anode metal layer and covering the light emitting diode elements, wherein the pixel defining layer has a plurality of grooves; 
 a cathode metal layer disposed on the pixel defining layer and electrically connected to the light emitting diode elements; and 
 a heat conducting insulator sandwiched between the anode metal layer and the cathode metal layer and disposed in the grooves, wherein the heat conducting insulator separately contacts the anode metal layer and the cathode metal layer to form a thermally conducting path between the anode metal layer and the cathode metal layer, 
 wherein the heat conducting insulator has a plurality of nano-ceramic particles. 
 
     
     
       2. The heat dissipating structure of the flexible display according to  claim 1 , wherein a heat dissipating material layer is disposed on the cathode metal layer to commonly form the thermally conducting path with the heat conducting insulator, the anode metal layer, and the cathode metal layer. 
     
     
       3. The heat dissipating structure of the flexible display according to  claim 2 , wherein the heat conducting insulator is made of an electrically insulating and heat conducting material, such that the anode metal layer and the cathode metal layer are in contact with and insulated from the heat conducting insulator; and the heat dissipating material layer is an electrically insulating transparent heat dissipating material which is in contact with and electrically insulated from the cathode metal layer. 
     
     
       4. The heat dissipating structure of the flexible display according to  claim 3 , wherein the heat dissipating material layer is an aluminum nitride film. 
     
     
       5. The heat dissipating structure of the flexible display according to  claim 3 , wherein the heat conducting insulator has a coefficient of thermal conductivity ranging from 50 to 150 w/m⋅° C. and a relative dielectric constant ranging from 5 to 60; and the heat dissipating material layer has a coefficient of thermal conductivity ranging from 100 to 200 w/m⋅° C. and a relative dielectric constant ranging from 5 to 60. 
     
     
       6. The heat dissipating structure of the flexible display according to  claim 1 , wherein a light shielding barrier is sandwiched between the anode metal layer and the cathode metal layer and disposed between the light emitting diode elements; and the heat conducting insulator is spaced apart from the light shielding barrier, and only disposed in a non-pixel display region. 
     
     
       7. The heat dissipating structure of the flexible display according to  claim 4 , wherein the heat conducting insulator further comprises a light absorbing pigment, and the heat conducting insulator is further disposed between the light emitting diode elements to be configured as a light shielding barrier. 
     
     
       8. A heat dissipating structure of a flexible display, comprising:
 a substrate provided with an active layer thereon the substrate, wherein the active layer is connected to a source electrode and a drain electrode; 
 an anode metal layer electrically connected to the drain electrode; 
 a plurality of light emitting diode elements disposed on the anode metal layer and electrically connected to the anode metal layer; 
 a pixel defining layer disposed on the anode metal layer and covering the light emitting diode elements, wherein the pixel defining layer has a plurality of grooves; 
 a cathode metal layer disposed on the pixel defining layer and electrically connected to the light emitting diode elements; and 
 a heat conducting insulator sandwiched between the anode metal layer and the cathode metal layer and disposed in the grooves to form a thermally conducting path between the anode metal layer and the cathode metal layer, 
 wherein the heat conducting insulator has a plurality of nano-ceramic particles. 
 
     
     
       9. The heat dissipating structure of the flexible display according to  claim 8 , wherein the grooves penetrate through the pixel defining layer, and the heat conducting insulator is separately in contact with the anode metal layer and the cathode metal layer, so that heat is directly transferred from the anode metal layer to the cathode metal layer via the heat conducting insulator. 
     
     
       10. The heat dissipating structure of the flexible display according to  claim 9 , wherein a heat dissipating material layer is disposed on the cathode metal layer to commonly form a thermally conducting path with the heat conducting insulator, the anode metal layer, and the cathode metal layer. 
     
     
       11. The heat dissipating structure of the flexible display according to  claim 10 , wherein the heat conducting insulator is made of an electrically insulating and heat conducting material, such that the anode metal layer and the cathode metal layer are in contact with and insulated from the heat conducting insulator; and the heat dissipating material layer is an electrically insulating transparent heat dissipating material, which is in contact with and electrically insulated from the cathode metal layer. 
     
     
       12. The heat dissipating structure of the flexible display according to  claim 11 , wherein the heat dissipating material layer is an aluminum nitride film. 
     
     
       13. The heat dissipating structure of the flexible display according to  claim 11 , wherein the heat conducting insulator has a coefficient of thermal conductivity ranging from 50 to 150 w/m⋅° C. and a relative dielectric constant ranging from 5 to 60; and the heat dissipating material layer has a coefficient of thermal conductivity ranging from 100 to 200 w/m⋅° C. and a relative dielectric constant ranging from 5 to 60. 
     
     
       14. A heat dissipating structure of a flexible display, comprising:
 a substrate provided with an active layer thereon the substrate, wherein the active layer is connected to a source electrode and a drain electrode; 
 a first metal layer electrically connected to one of the source electrode and the drain electrode; 
 a plurality of light emitting diode elements disposed on the first metal layer and electrically connected to the first metal layer; 
 a pixel defining layer disposed on the first metal layer and covering the light emitting diode elements; 
 a second metal layer disposed on the pixel defining layer and electrically connected to the light emitting diode elements; and 
 a vertically heat conducting insulator sandwiched between the first metal layer and the second metal layer to form a thermally conducting path between the first metal layer and the second metal layer, 
 wherein the heat conducting insulator has a plurality of nano-ceramic particles, and the heat dissipating material layer is an aluminum nitride film. 
 
     
     
       15. The heat dissipating structure of the flexible display according to  claim 14 , wherein the first metal layer is an anode metal layer and the second metal layer is a cathode metal layer, and wherein a heat dissipating material layer is disposed on the cathode metal layer to commonly form the thermally conducting path with the heat conducting insulator, the anode metal layer and the cathode metal layer. 
     
     
       16. The heat dissipating structure of the flexible display according to  claim 15 , wherein the vertically heat conducting insulator is made of an electrically insulating and heat conducting material, such that the anode metal layer and the cathode metal layer are in contact with and insulated from the heat conducting insulator; and the heat dissipating material layer is an electrically insulating transparent heat dissipating material, which is in contact with and electrically insulated from the cathode metal layer. 
     
     
       17. The heat dissipating structure of the flexible display according to  claim 16 , wherein the heat conducting insulator has a coefficient of thermal conductivity ranging from 50 to 150 w/m⋅° C. and a relative dielectric constant ranging from 5 to 60; and the heat dissipating material layer has a coefficient of thermal conductivity ranging from 100 to 200 w/m⋅° C. and a relative dielectric constant ranging from 5 to 60.